I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
daps dips dups taps tapis dupes tapes tapas dopes dipso diapause dopas deeps depose taupes teapoys tawpies tips tops tups tepas tipis tipsy topes topis topos types typos typps
baps naps cheaps whaps taps zaps saps wraps reaps raps paps neaps knaps haps maps leaps laps gaps caps heaps soaps daps waps chaps yaps